ACR Meeting Abstracts
Abstract Number: 1823 • 2012 ACR/ARHP Annual Meeting
Steven C. Vlad1, David T. Felson2, Donald R. Miller3 and Yuqing Zhang4, 1Clinical Epidemiology, Boston University, Boston, MA, 2Boston University, Boston, MA, 3Center for Health Quality, Outcomes, and Economic Research, Edith Nourse Rogers Memorial VA Hospital, Bedford, MA, 4Clinical Epidemiology Unit, Boston University, Boston, MA